Richard - I have checked tonight and the 1 1/2" dia one is unfortunately cast oval and oversize so not enough meat left to machine down to 1 1/4" dia. If you purchase a gunmetal 1 1/2" one though it would not be a big job to lop the end off and silver solder or braze a new smaller end in or as Hedd suggest modify your existing one by welding on a smaller dia steel tube.
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